Transmission for engines



I A'. L. POWELL. TRANSMISSION FOR ENGINES.

APPLICATION FILED DEC. 8, 1920.

1,384,341 Patented July 12, 1921.

WAQW

UNITED STATES PATENT OFFI QE.

ALVAH L. POWELL, OF MILES CITY, MONTANA, ASSIGNOR TO THE A. L. POWELLPOWER 00., 0]? MILES CITY, MONTANA, A CORPORATION.

TRANSMISSION FOR ENGINES.

Specification of Letters Patent.

Application filed December 8, 1920. Serial No. 429,175.

To all whom it may concern Be it known that I, ALVAH L. POWELL, citizenof the United States, residing at Miles City, in the county of Custerand State of Montana, have invented certain new and useful Improvementsin Transmission for Engines, of which the following is aspecification.

My invention relates to improvements in the transmitting member oiengines, by which I secure a variation in the movement of the pistonwith reference to that of the crank, enabling me to gain advantages inthe operation of such engines that are not possible with theconstructions at present used. This application covers improvements overthe forms given in a series of applications serially numbered 429,168,$29,170 to 429,174 inclusive, and 29,176, of which this is one, bearingthe same date. In the annexed drawing I show an application of myinvention, in which the figure is an elevation, giving the improvementas attached to a standard engine.

In my prior applications I have shown different means or operating thetransmitting members, and in this I describe a method similar to othersalready given; but in the present application I provide a detail ofimportance in operating particular forms or" my invention. and it is tothis improvement that I confine myself.

In the figure, a yo re, D, is attached to a piston A by a rod, A Thisyoke is slotted, and engages eccentrically formed rollers A One of theseis shown in solid lines; the other, on opposite side of engine beingrendered in dotted lines. The rollers described are rotatably mounted onpins, B B on crank levers B, B that turn on sins B B The centers ofthese pins are eccentric to each other. dotted lines. On the pins B arealso mounted segmental pinions, attached to the crank levers, androtatable with-them. These pinions engage the toothed crank rod B thelatter conventionally attached to a wrist pin, on the engine crank.

It is evident that downward movement of the piston A will cause thecrank levers to be depressed. the segmental. pinions forcing the crankrod B in a direction indicated by the arrow near the crank shaft. As theconnecting rod advances its angularity with This variation is indicatedinv reference to the engaging pinions will become greater, and the B Bwill compensate for mental pinion 13 moving center line of the engine asthe opposite one recedes. This will result in a variation in themovement of the segments in relation to each other, the motion or onebeing, at times, different from that of the other. The effect of thisvariation would alter the proper functioning of the rollers in theslotted yoke if no compensating means were provided to allow for it.This is furnished by the cocentric form given them. drawing, theeccentric roller A will permit a certain loss of movement between themotion of the yoke and that of the crank'lever B, the lost motion beingtaken up by the partial rotation of the eccentric roller. By settingthese rollers in a proper relation to the eccentrically disposedsegmental pinion centers, B E the variation in distance between thepinions and toothed crank connecting rod is compensated for at allpoints; that is, the segmental pinions will follow the alterations orposition that; arise from the angularity oi the movement of theconnecting rod, while the eccentric rollers in the away from the slottedyoke will govern the variation of movement of the oppositely placedcrank levers, iermittinga certain lag in the pressure of the slottedyoke, at moments necessary to the proper functioning of the segmentalpinions. The curved form of the slot in the yoke is to assistthemovement of the eccentric rollers.

llhat I believe is new and ask to have protected by Letters Patent, is'-i in a differential transmission member, the combination of pins,rocking levers mounted on said pins, segmental pinions eccentricallvmounted on said pins and rotatable with said levers, eccentric-rollerson said levers, slotted forks engaging said eccentric rollers, a yokesupporting said forks, a barextendtaching the bar to said piston, arack, a

Patented July 12, 19.21. i

7 space between them 7 W111 vary. The eccentr1c1ty of the plnions this,the seg crank connecting rod forming part of said rack, and meanswhereby the teeth of the before mentioned' pinions mesh with said rack,for the purpose hereinbefore described. In testimony whereof I aflix mysignature.

' ALVAH' L. POWELL.

